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"Specificity versus (quasi-) randomness" revisited
1Ist Department of Anatomy, Semmelweis University Medical School, Budapest, Hungary.
Acta Morphologica Hungarica
|January 1, 1990
Summary
Modern methods reveal greater specificity in cerebral cortex neuron connections than previously thought. However, significant potential for functional plasticity in neuronal circuits persists, even after birth.
Area of Science:
- Neuroscience
- Cell Biology
- Neuroanatomy
Background:
- Previous studies suggested lower specificity in local neuronal connections within the cerebral cortex.
- Advancements in identification techniques were needed to re-evaluate these earlier speculations.
Purpose of the Study:
- To re-evaluate earlier speculations on neuron connectivity in the cerebral cortex using modern cross-identification methods.
- To assess the specificity of local neuronal connections and the potential for plasticity.
Main Methods:
- Identification of individual neurons and their synapses.
- Physiological characterization of neurons.
- Light and electron microscope analysis, including immunocytochemistry.
Main Results:
- Modern methods indicate a higher degree of specificity in the choice of neuronal connections than previously underestimated.
- Despite increased specificity, substantial capacity for epigenetic or functionally induced plasticity in neuronal circuits remains.
- This plasticity is evident even in later stages of development, including postnatal stages.
Conclusions:
- The specificity of local neuronal connections in the cerebral cortex was underestimated in earlier studies.
- Neuronal circuits exhibit significant plasticity, allowing for re-arrangement even postnatally.
- Future research should explore the mechanisms and extent of this functional plasticity.